220v to 12v without transformer

Hello friends, today in this video I have shown how to make a 220v to 12v converter circuit. Please note, this circuit is not isolated from mains so don’t touch any naked wire in this circuit when the circuit is plugged in.

If you want to increase the brightness of the led use 10W led and 2.2uf ceramic capacitor in place of 1uf. This capacitor must be rated 400v or above.

Li-ion charger circuit using 1 transistor

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[TechIdeasAG]

Li-ion charger circuit using 1 transistor

[Blade]

WOW! I saw this circuit in a book from the late 60's. I used it to replace the light bulb in my parents' fridge 20-ish years ago. The "light bulb" was salvaged when the old fridge was discarded and now is installed in a night light lamp. No houses on fire until now...

[susantpal]

Thanks for the video clip but if you had used a multimeter to show the output it would have been complete. Now, please tell me how much Amp current it will output?

[BBE]

I've been using simplified version as mains indicator. just with small red led (like 2 mA current) and although it's nice little circuit, with justified use in some cases, I wouldn't recommend it to people without experience. it's really dangerous, and you should know the necessary precautions to use it..

[سعداللہنظامی]

You are not informing with positive and negetive. I do and blast it💥💥

[oilbay]

Two bottom side diodes of the bridge should be 27 V /1.3 W zener. There must be a 100 Ohms 2 Watts resistor serie connected to 1uF capacitor. This capacitor should be rated to 400V AC at least and type X2 (ask your component dealer) Otherwise you get a very good explosion after a short while.
This circuit was used in the past even by Siemens for space constrainted applications. It is stil used by some Chinese and Indian manufacturers in cheap LED bulbs. Even there is an IC which utilizes this configuration. And yes, their lifetime is very short

[jimparsons]

Liked it. An inexpensive, practical solution that could be used to power other low voltage projects too.

[snehalmahulkar]

Superb DIY
Comment after making and using this kind.
Best 👍

[jaystanjones]

Very useful nice circuit . Thanks for presenting.

[BeRighte]

Very good Many casual do circuit videos and handle ac current casual holding it.its a bad think.kids watch.they will be misguided.ur good in informing and putting a tester to show the live current.well done

[tomtaylor]

No, this is a really poor idea and I would discourage anyone from attempting to build.

The output is dependant on the load - you have no way of regulating here, which is what you imply from the title! You also have a 25v electrolytic which would be stressed with that same over-voltage.

As you mention in the video, this circuit is dangerous as it is mains referenced - why on Earth (pun intended) would you not want a transformer? - they’re cheap enough... Even safe switched-mode supplies are cheap as chips now.

I don’t believe you really understand this circuit, which is why you don’t explain its operation and you shouldn’t show people how to play with fire
💡🔥⚡️🤡

[alexissandoval]

Por fin un video donde muestra paso a paso con las referencia y coneciones de los materiales felicitaciones...excelente

[theRealKThing]

Focus on 1:01 second of the video, you will notice the circuit was wrong, then they change the circuit secretly 😂😂😂

[besnw]

I thought it was a dangerous circuit.
If the LED is disconnected or misconnected, it will destroy the electrolytic capacitor

[f.k.burnham]

When using diodes with shorter than original lead length, you MUST reduce current rating of the diode, per Sylvania ECG Engineering staff. Solder should be applied to the joint, not put on the iron and transferred to the joint. That circuit should have a fuse in it also. Very dangerous construction to use it that way. We often use a capacitor of a certain size to reduce AC voltage input to antique radios that originally had resistance line cords.

[hansukumar]

Sir, very nice. Sir, what is the value of resistor 100 ohms ? Watt how much.

[Harshavardhan-zrip]

Nice,
But please make a video
How ceramic capacitor convert
220v -12v mechanism clearly

[ТимофійМашинський-ое]

2:36 Цепь не изолирована от электросети, поэтому не прикасайтесь к цепи, когда она подключена (кто не знает это перевод на русский язык)
Причина: удар током. После удара тока умирает человек, поскольку 220 вольт и может быть опасно. Рекомендуем купить защитные средства от удара током.

[igorturchinyuk]

Many young radio amateurs who will try to repeat this electric circuit will be killed!)))

[alphinthomas]

It's a good project.
Thanking you for giving this idea.